Microscope objective



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UNITED STATES PATENT' OFF ICE J'OKIC. BAIELOI' I HZIi 111m 101m, assienon. ro meson amour onion.

GOD-ANY, 12.0 m YORK, AGOBPOBA'HOR OF NEW YORK K103080023 omcnvn Application fled January 8, 1881. Serial Io. 508,887.

This invention relates to optical instruments and more articularly it has reference to mountings for ens stems such as are emed in microscope o jectives, for example.

One of the objects of my invention is to provide an improved mounting of the character described. Another object is to provide an objective mounting novel and improved means for effecting parfocalizing when assembling the parts thereof. Still another object is to provide a mounting in which the lens elements can be easily centered so that the optical axes of the lens elements will be coincident with the axis of the mounting. These and other ob'ects and advantages reside in'certain novel eatures of construction, arrangement and combination of parts as will hereinafter be more fully described and pointed out in the appende claims.

I0 The figure of the drawing shows a vertical sectional view of a microscope objective embodying my invention. The mount' comprises a tubular .member 10 which as a threaded portion 11 by means of which the objective 1s attached to the body tube or nose piece of a microscope so that the end of the tube or nose piecefiange abuts against the ihoulder 32 on the objective. The llensl cells 3,14 an 15, carryin respective y, enses 16, 17 and 18, are slidaily ositioned within the smooth bore of the tu ular member 10. A spacing member 19 is between cells 14 and so asto rovide the proper distance between lenses lgand 18. 5 Threaded to the outer wall of tubular member 10, by threads 20, is the cylindrical tube or casing 21 having an inwardly extending flan 22 abutting against the shoulder 23 on t e lower lens cell 15. Adjustably secured 0 to the inner wall of tubular member 10, by

threads 24, is the retaining member or nut 25 which bears against the cylindrical spacing member 26 which, in turn, bears against the top lens cell 13. The nut 25' is provided 5 with the diaphragm opening 26 which niay be of any sultable size. The nut' 25 also has two holes 27 with which a spanner wrench cooperates in order to facilitate adjustmentof thenut. I A group of objectives is said to be parfocal so that they are centered with respect to the when each optical system has been adjusted relatively to a fixed ortion or shoulder, on the objective, which ars a fixed relation to the microscope body tube to which the obective is attached. Thus, when several parfocal objectives, each of a different power, are attached to a revolving nose piece, very little, if any, focusing ad ustment is necessary when passing from one objective to another. In a series of objectives, manufactured according to my invention, the shoulder 12 acts as a limiting stop when the objective is screwed into the microscope body tube or attached to a revolving nose piece. Hence, the series of objectives may be parfocalized by adjusting the optical system of each objective with respect to the shoulder 12. This parfocalizing adjustment can be readily efected, in my improved objective, by relative m adjustments of the nut 25 and the threaded tube or casing 21. Such a means for effecting a parfocal adjustment greatly facilitates and cheapens the manufacture of objectives. Under rior art methods parfocalizing is usually o tained by turning down a spacin ring and then trying it in the objective. an continuing until the desired results are obtained.

Another advantage of my improved structure resides in the fact that the lens cells 13, 14 and 15 are mounted directly within the bore of the tubular member 10. Hence, the lens elements 16, 17 and 18 are securely held axis of the tubular member 10. 'Since the. threads 11 and the shoulder 12 are cut with respect to the axis of the tubular member 10, the optical axis of the objective will coincide with the axis of the body tube to which it is attached. From the foregoing it will be apparent that I am able to. attain the objects of my invention and provide an improved objective mounting which will embody improved means for effecting parfocalizing adjustments andinsure proper centering of the lens elements with respect to the axis of the mounting which is attached to the body tube of a microscope. Various modifications can i obviously be made without departing from the irit of my invention.

I c aim:

1. An objective comprisin a tubular member having a smooth mner re, two spaced retaining members threadedly secured to said tubular member, lens cells carryin' g lenses, said cells being concentrically an snugly fitted said bore and slidable on the walls thereof, said cells being held between said retaining members whereby said lenses may be secured in adjusted position within the bore of the tubular member.

2. An objective comprising a tubular member having a smooth inner wall, lens cells. slidably mounted on the wall within said tu-y I .bular member, a casing member threaded to said tubular member, a retaining member threaded to said tubular member, said casing member and retaining member serving to retain said lens cells in adjusted position within said tubular member.

3. In a device of the character described, the combination of a tubular member having attaching threads and a shoulder adjacent thereto lens cells slidably mounted within.

said tubular member, a casin threaded to said tubular member, said casing having an inwardly projecting flange abutting against one of said cells and a retainin member threaded to the inner wall of said tubular member for holding said cells in adjusted position with respect to said shoulder.

4. A microscope objective comprising a tubular member having a shoulder portion, a plurality of lens cells slidably mounted within said tubular member, a lens carried by each of said cells, a casing threadedly secured to said tubular member, said casin havin an inwardly extending flange W%.l0h abuts against one of said cells, a spac' member a uttingagainst another of said ce threaded to the inner walls of said tubular member. and abutting against said spacing member.

- 5. Amicroscope objective comp atubular member having attaching threa and a shoulder adjacent thereto, said member havmg an inner cylindrical opening,- lens cells carrym lenses, said cells being snugly fitted and sli' ably osed within said opening, two spaced mem rs threadedly secured to said tubular member, said cells being mounted between said spaced members whereby said lenses may be adjustably positioned with respect to said shoulder for the purpose of parfocalizing.

J OHN G. SABEL.

said tubular member and an apertured nut 

